US PATENT SUBCLASS 340 / 658
.~.~.~ Phase or frequency


Current as of: June, 1999
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340 /   HD   COMMUNICATIONS: ELECTRICAL

500  DF  CONDITION RESPONSIVE INDICATING SYSTEM {6}
540  DF  .~ Specific condition {18}
657  DF  .~.~ Electrical characteristic {4}
658.~.~.~ Phase or frequency


DEFINITION

Classification: 340/658

Phase or frequency:

(under subclass 657) Subject matter where the monitored characteristic is electrical phase or frequency.

SEE OR SEARCH CLASS

324, Electricity: Measuring and Testing,

76.39+, and 76.77+ for frequency and phase measurement, respectively.